Asparagus pee What causes the smell Medical News TodayGarden Asparagus can cause a noticeable odor in your urine. It is widely known that eating this green vegetable can cause a strong aroma while visiting the restroom. If you see an offensive odor after enjoying a meal including asparagus, there's no need to worry. It is just a normal reaction that occurs physiologically. Be reassured that the smell poses no harm and will fade eventually.